App was working for 2 years. People from customer's infrastructure team also say that there were no changes (no update or anything). Also this happens only in production environment. We were unable to simulate this in UAT env even with tripled number of actual production users.

App was working for 2 years. People from customer's infrastructure team also say that there were no changes (no update or anything). Also this happens only in production environment. We were unable to simulate this in UAT env even with tripled number of actual production users.